Immobilizer, code telling me that my key was not recognized?

Tiny
SUSAN_PENTZ
  • MEMBER
  • 2007 HONDA ACCORD
  • 1.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
I was driving and the car shut down. When I tried to restart, I got the code telling me that my key was not recognized. I tried two spare keys, same message. Do I pay to get my keys reprogrammed, or is this possibly an electrical issue that is going to happen again?
Monday, July 7th, 2025 AT 1:41 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Yep, I have seen the immobilizer control unit go bad and not see the key code frequency. Here is the part you need, they get old and stop working, like me lol. Check out the images (below). Please let us know what happens.
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Monday, July 7th, 2025 AT 5:49 PM
Tiny
SUSAN_PENTZ
  • MEMBER
  • 3 POSTS
Is this what I need?
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Tuesday, July 8th, 2025 AT 5:22 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Yes that was the part I replaced, the first image. If you want to be sure I would do a CAN scan which it should have a code for. Here is a video to help see.

https://youtu.be/u-4syLc-ifQ

This is a common problem, this is what usually fixes it.
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Wednesday, July 9th, 2025 AT 5:41 PM
Tiny
SUSAN_PENTZ
  • MEMBER
  • 3 POSTS
Thank you so much. I looked up how to replace that part, and it looks pretty easy. I sure hope so!
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Wednesday, July 9th, 2025 AT 6:49 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Yep, it is not too bad, let me know if you run into problems and I can help walk you through them. Please upload images so I can see.
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Thursday, July 10th, 2025 AT 9:28 AM

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